:root {
  --ink: #13202c;
  --muted: #637383;
  --line: #dfe6ec;
  --paper: #f6f8f8;
  --soft: #edf3f2;
  --brand: #0f8f8a;
  --brand-dark: #0a5f61;
  --gold: #b68a43;
  --white: #fff;
  --shadow: 0 18px 50px rgba(19, 32, 44, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(18px, 4vw, 58px);
  background: rgba(246, 248, 248, .9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(223, 230, 236, .75);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--white);
  background: var(--brand-dark);
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  margin-top: 1px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #344555;
  font-size: 15px;
  font-weight: 700;
}

.nav a:hover { color: var(--brand-dark); }
.menu-btn { display: none; }

.hero {
  min-height: 92vh;
  position: relative;
  display: grid;
  align-items: end;
  overflow: hidden;
  background: #101820;
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 16, 24, .82) 0%, rgba(8, 16, 24, .58) 42%, rgba(8, 16, 24, .16) 100%),
    linear-gradient(0deg, rgba(8, 16, 24, .52), rgba(8, 16, 24, 0) 48%);
}

.hero-content {
  position: relative;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 150px 0 54px;
  color: var(--white);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--gold);
  text-transform: uppercase;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .08em;
}

.hero h1 {
  margin: 0;
  font-size: clamp(56px, 8vw, 104px);
  line-height: .95;
  letter-spacing: 0;
}

.hero-lead {
  width: min(680px, 100%);
  margin: 24px 0 0;
  font-size: clamp(18px, 2.2vw, 25px);
  color: rgba(255,255,255,.9);
}

.hero-actions,
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-actions { margin-top: 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 12px 20px;
  border-radius: 6px;
  font-weight: 800;
  border: 1px solid transparent;
}

.btn.primary {
  color: var(--white);
  background: var(--brand);
}

.btn.primary:hover { background: var(--brand-dark); }

.btn.ghost {
  color: var(--white);
  border-color: rgba(255,255,255,.55);
  background: rgba(255,255,255,.08);
}

.wide { width: 100%; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 150px));
  gap: 14px;
  margin: 54px 0 0;
}

.hero-stats div {
  padding: 14px 16px;
  border: 1px solid rgba(255,255,255,.24);
  background: rgba(255,255,255,.1);
  backdrop-filter: blur(10px);
  border-radius: 8px;
}

.hero-stats dt {
  font-size: 24px;
  font-weight: 900;
}

.hero-stats dd {
  margin: 2px 0 0;
  color: rgba(255,255,255,.75);
  font-size: 13px;
}

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0;
}

.section-head {
  max-width: 740px;
}

.section h2,
.visual-band h2,
.cta h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-head p:not(.eyebrow),
.intro-text,
.visual-band p,
.cta p {
  color: var(--muted);
  font-size: 17px;
}

.intro {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.intro-text {
  margin: 28px 0 0;
  font-size: 21px;
  color: #354756;
}

.split {
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: 42px;
}

.service-grid {
  display: grid;
  gap: 14px;
}

.service,
.proof-grid article,
.contact-card {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(19, 32, 44, .05);
}

.service span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
}

.service h3,
.proof-grid h3 {
  margin: 10px 0 8px;
  font-size: 24px;
}

.service p,
.proof-grid p,
.contact-card p {
  margin: 0;
  color: var(--muted);
}

.visual-band {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  align-items: center;
  gap: clamp(24px, 5vw, 70px);
  padding: 34px clamp(20px, 4vw, 58px);
  background: #10252b;
  color: var(--white);
}

.visual-band.reverse {
  grid-template-columns: .95fr 1.05fr;
  background: #edf3f2;
  color: var(--ink);
}

.visual-band.reverse img { order: 2; }

.visual-band img {
  width: 100%;
  height: min(540px, 54vw);
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.visual-band p { color: rgba(255,255,255,.74); }
.visual-band.reverse p { color: var(--muted); }

.tag-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 32px;
}

.tag-grid span {
  min-height: 58px;
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border-radius: 8px;
  background: var(--soft);
  border: 1px solid var(--line);
  font-weight: 800;
}

.proof {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 38px;
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 34px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  counter-reset: step;
}

.timeline li {
  position: relative;
  min-height: 146px;
  padding: 52px 22px 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.timeline li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 22px;
  color: var(--brand);
  font-weight: 900;
}

.timeline strong {
  display: block;
  font-size: 20px;
  margin-bottom: 8px;
}

.timeline span {
  color: var(--muted);
}

.faq-list {
  margin-top: 30px;
  display: grid;
  gap: 12px;
}

details {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px 22px;
}

summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 900;
}

details p {
  margin: 14px 0 0;
  color: var(--muted);
}

.cta {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto 70px;
  padding: clamp(30px, 6vw, 58px);
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 34px;
  align-items: center;
  background: var(--ink);
  color: var(--white);
  border-radius: 8px;
}

.cta p { color: rgba(255,255,255,.76); }
.contact-card { color: var(--ink); }
.contact-card p { margin: 10px 0 18px; }

.contact-methods {
  display: grid;
  gap: 6px;
  margin: 12px 0 16px;
  padding: 14px;
  border-radius: 8px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.contact-methods a {
  color: var(--brand-dark);
  font-size: 28px;
  line-height: 1.1;
  font-weight: 900;
}

.contact-methods span {
  color: var(--muted);
  font-weight: 800;
}

.wechat-qr {
  width: min(100%, 280px);
  margin: 0 auto 20px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--white);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 4vw, 58px);
  color: #586979;
  background: var(--white);
  border-top: 1px solid var(--line);
}

.footer p { margin: 4px 0 0; }
.footer a { font-weight: 800; color: var(--brand-dark); }

@media (max-width: 900px) {
  .site-header { height: 66px; }
  .nav {
    position: fixed;
    top: 66px;
    left: 0;
    right: 0;
    display: none;
    padding: 16px 20px 22px;
    background: rgba(246, 248, 248, .98);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }
  .nav.open {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
  }
  .nav a {
    padding: 10px 0;
  }
  .menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--line);
    background: var(--white);
    font-weight: 800;
  }
  .hero { min-height: 92vh; }
  .hero-content { width: min(100% - 32px, 680px); padding-bottom: 34px; }
  .hero-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .intro,
  .split,
  .visual-band,
  .visual-band.reverse,
  .proof,
  .cta {
    grid-template-columns: 1fr;
  }
  .visual-band.reverse img { order: 0; }
  .visual-band img { height: 360px; }
  .tag-grid,
  .proof-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .brand small { display: none; }
  .hero-content { padding-top: 110px; }
  .hero-lead { font-size: 17px; }
  .hero-stats,
  .tag-grid,
  .proof-grid,
  .timeline {
    grid-template-columns: 1fr;
  }
  .section { padding: 62px 0; }
  .visual-band { padding: 28px 20px; }
  .visual-band img { height: 280px; }
  .cta { margin-bottom: 42px; }
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}